Servo Motor Multistage Drive Vibration Filtering by Load Position
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Solution Overview
Problem
Existing vibration suppression methods for servo motor and load multistage drive systems are inadequate, as they either require complex online measurements for adaptive parameter setting or are limited to simple single-stage systems with fixed vibration frequencies, failing to accurately account for varying vibration frequencies related to load positions.
Innovation Solution
An offline method measures fixed and variable vibration frequencies, creating a two-dimensional table of vibration frequencies versus load positions, using fixed-frequency and variable-frequency parameter filters, with fixed-frequency filters eliminating fixed vibrations and a variable-frequency filter eliminating position-dependent vibrations through linear interpolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If adaptive parameter setting method is used to measure vibration frequency online, then vibration suppression accuracy is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by measuring and storing vibration frequencies at different load positions offline before actual operation. The system pre-establishes a two-dimensional table containing vibration frequency data for various load positions, eliminating the need for complex real-time online measurement during operation. This approach maintains measurement accuracy while significantly reducing system complexity during runtime.
2Device complexity
If fixed parameter setting method is used for vibration suppression filter, then system simplicity is maintained, but vibration suppression effectiveness deteriorates when vibration frequency varies
Solution Approach 1:
The patent applies dynamics by transitioning from a static fixed-parameter filter to a dynamic variable-parameter filter. The filter's frequency parameter is dynamically adjusted based on the current load position by querying the pre-measured two-dimensional table. This allows the system to maintain simplicity in structure while achieving adaptability to varying vibration frequencies, thus resolving the contradiction between simplicity and effectiveness.
3Measurement precision
If online vibration frequency measurement is performed during running, then vibration suppression accuracy is improved, but implementation complexity increases
Solution Approach 1:
The patent performs vibration frequency measurements in advance during the setup phase, storing results in a two-dimensional table indexed by load position. During actual operation, the system simply queries this pre-prepared table based on current load position, avoiding complex real-time measurement hardware and algorithms. This significantly reduces implementation complexity while maintaining measurement accuracy.
4Device complexity
If a single fixed-frequency filter is used, then device simplicity is maintained, but adaptability to varying vibration frequencies is lost
Solution Approach 1:
The patent transforms a static single fixed-frequency filter into a dynamic variable-frequency filter system. The filter's center frequency is dynamically determined by the current load position through table lookup, enabling the same physical filter to adapt to different vibration frequencies without requiring multiple fixed filters. This maintains hardware simplicity while achieving full adaptability.
Data Source
AI summary
A vibration suppression method for a servo motor and a load multistage drive system is provided. For a number N of fixed vibration frequencies and one vibration frequency varying with a load position existing in a multistage drive mechanism, a number of N+1 vibration suppression filters are adopted, and each filter is configured to eliminate a corresponding vibration frequency. Fixed vibration frequencies and a vibration frequency varying with a load position in a multistage drive system are measured by using an offline method, and the varied vibration frequencies are made into a two-dimensional table related to the load positions. The fixed vibration frequencies are eliminated by using fixed-frequency parameter vibration suppression filters; and the varied vibration frequencies are eliminated by using a variable-frequency parameter vibration suppression filter, and the vibration frequencies are obtained in real time according to the load positions and the two-dimensional table.